Profile of a planetary gearbox
The two-speed gearboxes have a planetary design. The central sun wheel distributes the power to several planet wheels which revolve around it. The outstanding advantage of this design is its compactness. The gear-changing device, a splined sleeve that moves axially, is of form-fit design.
Position 1: Gear ratioi1 = 4
Position 2: Gear ratioi2 = 1
The motor is flange-mounted onto the change-speed gearbox using an adapter plate. The AC motor must be suitably prepared for mounting.
For shaft heights of SH 160 and higher, motors of types of construction IM B35 and IM V15 must be supported free from stress on the non-drive end.
Any transverse force imported into the gearbox has to be borne by the gearbox and transmitted to the machine base.
The motors for all 2K gearboxes must be full-key balanced with a fitted key. The 2K 120, 2K 250, 2K 300 gearboxes are enclosed, so that the motor flange is adequately sealed in the standard version.
Vertical mounting positions for the IM V15 and IM V35 require circulating-oil lubrication of the gearboxes.
The standard version of the change-speed gearboxes up to and including the 2K 300 has a maximum circumferential backlash of 30 angular minutes (measured at the gear output). Several special versions suitable for milling or machining with cut interruption can be supplied on request:
- Reduced backlash with special features: max. 20'
- Reduced backlash for high performance: max. 15'
The power unit (motor and gearbox) is supplied with vibration magnitude grade R in accordance with EN 60034-14 (IEC 60034-14). This is also the case when the motor is ordered with vibration magnitude grade S.
The belt pulley1) should be a cup wheel type pulley. For mounting the belt pulley, the output shaft on the gearbox has a flange with an external centering spigot and tapped holes for easy fitting and removal of the pulley.
Motors with built-on planetary gearbox
The 1PH motors can also be supplied with flange-mounted planetary gearboxes. The motor-gearbox unit is tested for correct functioning. The complete drive unit - that is, 1PH7 or 1PH4 motor with mounted ZF change-speed gearbox - can be ordered directly from Siemens:
Siemens AG
Industrial Solutions and Services
Contact: Mr. Britz
Im Schiffelland 10
66386 ST. INGBERT
Germany
Fax: +49 6894 891-112
E-mail:
hans-peter.britz@siemens.com
The following details must be specified with the order:
Ordering example for 1PH4 motor:
Motor complete with gearbox
1PH4133-4NF26-Z
K00
2LG4315-3FD11
Ordering example for 1PH7 motor:
Motor complete with gearbox
1PH7186-2NE03-0BC2
2LG4260-1JC21
1PH7163-2NF03-0CC0
2LG4320-3JD11
1) Not included in scope of supply.